When we wave the four species on Succot, three are bound together, while the etrog is held separately. The etrog represents this world, which is separate from the Heavenly realms. Yet, the etrog also has a small crown at its end which, although fragile, is all-important because the commandment of waving the four species can be performed only when it is intact. This crown represents the world's attachment to the Source of all blessings, while the etrog's independence from the other species shows Israel's disassociation from God in our daily state of awareness.
From the "Living Kabbalah" by Simcha Benyosef.
This year I would like to find an etrog with the pitom.
Demons resemble angels in three ways: They have wings, they can fly throughout the universe, and they hear what transpires in heaven. They also resemble mortals in that they procreate, eat, and die. They are always invisible, except under special conditions.